Half-Life 2: Episode One is the first in a trilogy of episodes that serve as the sequel for the 2004 first-person shooter video game Half-Life 2. It was developed by Valve Corporation and released on June 1, 2006. Originally called Half-Life 2: Aftermath, the game was later renamed to Episode One after Valve became confident in using an episodic structure for the game. Similar to Half-Life 2, Episode One also uses the Source game engine. The game debuted new lighting and animation technologies, as well as AI 'sidekick' enhancements.The game's events take place immediately after those in Half-Life 2, in and around war-torn City 17. Episode One follows scientist Gordon Freeman and his companion Alyx Vance as they fight in humanity's continuing struggle against the transhuman race known as the Combine. When the story begins, Gordon wakes up outside the enemy's base of operations, the Citadel, after being left unconscious from the concluding events of Half-Life 2. During the course of the game, Gordon travels with Alyx as they attempt to evacuate the city. As the game comes to an end, Gordon and Alyx are caught in a major accident, and both of their fates are revealed in the sequel, Episode Two.

Valve views episodes One through Three as tantamount to a standalone release. Episode One is available as part of a bundle package known as The Orange Box, which also includes Half-Life 2, Episode Two, Team Fortress 2, and Portal. Episode One received a generally positive critical reaction, and the co-operative aspects of the gameplay received particular praise. A common criticism of the game was its short length, leading several reviewers to say that the game's four to six hours of gameplay do not justify its price.

In Episode One, a first-person shooter video game, players make their way through a linear series of levels and encounter various enemies and allies. The gameplay is broken up between combat-oriented challenges and physics-based puzzles. Episode One also integrates tutorial-like tasks into the story to familiarize the player with new gameplay mechanics without breaking immersion. A head-up display appears on the screen to display the character's health, energy, and ammunition. Throughout the course of the game, the player accesses new weapons and ammunition that are used to defend the character from enemy forces. Also, in the beginning of the game, the player gains a unique weapon, the gravity gun, which plays a crucial role and allows the player to use physics to manipulate objects at a distance in both combat and puzzle-solving scenarios.

System requirements
Minimum
1.2 GHz processor, 256 MB RAM, DirectX 6 compatible card, Internet connection[1]
Recommended
2.4 GHz processor, 512 MB RAM, DirectX 9 compatible card, Internet connection[1]

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